Geographical clock



y 1934. B. KRZEMINSKII 1,959,831

GEOGRAPHICAL CLOCK Filed Nov. 9, 1931 3 Sheets-Sheet l Ina-entanjrorzZan zfrzenairzskd Z W 'T fil /'07. Q

May 1934.

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Patented May 22, 1934 UNITED STATES PATENT OFFICE Application November9, 1931, Serial No.

1 Claim.

My invention relates to a geographical clock by which the time of day ornight in hours and minutes can be told in any longitude or meridianthroughout the principal parts of the world. The primary object of theinvention is the production of a clock of the type stated which issimple in construction, attractive in appearance, inexpensive andefficient in operation. Among further objects is to provide a clock ofthe type stated by which the hours and minutes are displayed so thatthey can be easily read when applied to any locality in the principalparts of the world.

In the accompanying drawings, forming part of this specification, Fig. 1is a front elevation of my invention; Fig. 2 is a vertical section of myinvention taken on the line 22 of Fig. 1, and Fig. 3 is a section takenin substantially the same plane as in Fig. 2, of an alternativeconstruction.

In the drawings, A is a vertical transparent terrestrial cylinder madeof glass or other suitable material having its cylindrical surfacemapped at 10 in projection to indicate thereon the principal portions ofthe earth's surface divided by the usual standard meridian lines 11 intotwentyfour hour longitudinal spaces. A transparent band 12 through themap and encircling the terrestrial cylinder substantially midway betweenits upper and lower ends provides a space through which the hour digits13, on the periphery of the revoluble hour disc B, within the cylinder(to be hereinafter described) are visible. The terrestrial cylinder isrevolubly seated in circular bearing grooves 14 and 15 which are formedin upper and lower horizontal frame supports 16 and 17, the latter beingtied together by vertical columns 18, the cylinder being free to beturned about its vertical axis by hand in the frame work, thus providedso that any vertical longitudinal space on the map displayed on thesurface of the cylinder can be positioned foremost. Suitably mountedwithin the terrestrial cylinder A and the frame work provided by theupper and lower frame supports 16 and 17 is a suitable clock workmechanism C having a driving spring 18, train of gearing 19, hour takeoil shaft 20 extending downwardly, and minute take off upwardly. Thehour take off shaft 20 is arranged co-axial with the axis of thecylinder A and is stepped in the bearing support 22' on the lower framesupport 17. This shaft 20 carries the hour disc B, revoluble in ahorizontal plane with its digits 13 visible through the transparent band12 on the cylinder A. The digits 13 are in two evenly ,spaced groupsfrom 1 to 12 each, the two groups encircling the cylinder in series andbeing differentiated by color or otherwise to indicate day or nighttime.

The disc is revolved once in every twenty-four hours while the cylinderremains stationary and its digits register successively with a sightband no or scroll 22 on a transparent stationary sight piece C, thelatter extending vertically along the side of the cylinder and beingsecured to the upper and lower frame supports 16 and 17. The sight piececan be made out of celluloid or any as opening through which the digits13 on the hour disc B are visible.

hand in its bearing seats.

scribed is also set correctly.

The minute hand operating mechanism, consists of ordinary minute gearing25 connected with the clock work minute take off shaft 21 and operatinga transverse shaft 26, the latter carrying a minute hand 27 revolublydisposed over a minute indicating dial 28. A suitable housing 29 carriedby the upper frame support 16 acts as a support wardly so that the hourand minute during day or night indicated by the sight piece C and disc Bcan be traced north or south along any longitudinal space on thecylindrical map which registers with the sight piece. Also by comparingthe digit appearing through the transparent band in cylinder A with thecorresponding longitude, the

time of day or night is also indicated in any other portion of the worldsimultaneously.

The adjustment of the cylinder revolubly, en-

ables the clock to be set so that the time of day or night can be toldnot only from the sight piece at the place where the clock is stationedbut instantly in any part of the world shown by the map by comparing thedigits on the hour disc respectively with the corresponding longitudeshown on the terrestrial cylinder. Obviously, theminute indicatorfunctions for any longitude on the cylinder without change in positionof the cylinder.

In the alternative construction shown in Fig. 3, the hour indicatingdisc B is revolubly situated near the lower end of the cylinder andco-operates through the transparent band 30 with the sight element C inthe same manner as described above. The hour shaft 31 revolves about anarbor 32 and carries the hour disc B in the terrestrial cylinder and acrown gear 33 from which the minute indicating mechanism E is driven,said minute mechanism having a minute indicating hand 34 and dial 35 inthe lower portion of the structure instead of above as shown in thepreferred construction described above. The clockwork mechanismrepresented by F for driving the main shaft 31 may be any form ofclockwork actuating device, electrical or mechanical.

In accordance with the patent statutes, I have described the principlesof operation of my invention, together with the apparatus which I nowconsider to represent the best embodiment thereof, but I desire to haveit understood that the construction shown is only illustrative and thatthe invention can be carried out by other means and applied to usesother than those above set forth within the scope of the followingclaim.

Having described my invention what I claim as new and desire to secureby Letters Patent is:

A geographical clock, comprising, in combination, a vertically disposedtransparent cylindrical shell mapped in projection on its surface toindi cate thereon the principal portions of the earths surface anddivided by standard meridian lines into twenty four hour longitudinalspaces, a frame having upper and lower end members in which the endedges of said cylinder are journalled whereby the cylinder mayberevolved by hand about its axis and any vertical space on the mapdisplayed by the cylinder can be positioned i'oremost, clock workmechanism having an hour shaft 'co-axially disposed in said cylinder, anhour disc revolubly supported by said shaft in said cylinder having hourdigits visible through said cylinder and adapted to register with saidlongitudinal spaces indicated on the surface of said cylinder toindicate the hour of day or night north or south in the correspondinglongitude, a sight on said frame with which the digits on said hour discare adapted to coincide successively as the disc revolves to indicatethe hour in a predetermined locality, and minute mechanism actuated bysaid clock work mechanism having a minute indicating dial andcooperating minute hand adapted to display the minutes during any hourin any longitude indicated by the hour disc on the surface of thecylinder.

BRONISLAW KRZEMINSKI.

